On the Role of Low-Energy CP Violation in Leptogenesis

Understand

The link between low-energy CP violation and leptogenesis became more accessible with the understanding of flavor effects.

• However, a definite well-motivated model where such a link occurs was still lacking.
• Adjoint SU(5) is a simple grand unified theory where neutrino masses are generated through the Type I and Type III seesaw mechanisms, and the lepton asymmetry is generated by the fermionic triplet responsible for the Type III seesaw.
• We focus exclusively on the case of inverted hierarchy for neutrinos, and we show that successful flavored leptogenesis in this theory strongly points towards low-energy CP violation.